Enhancing your connection
What you can do to enhance your connection:
if reception is not the best, make sure to switch the device into GPRS mode only, otherwise it will try to switch back and forth between UMTS and GPRS
use a UDP based VPN, through which you route all the traffic
this will enhance the rtt
avoids proxy crap done by ISPs
...and of course gives you access to a device usually hidden behind the NAT of the ISP.